Fixed sync issue

boards/management/commands/sync_with_server.py

@@ -65,7 +65,7 b' class Command(BaseCommand):'
                 models = root.findall('models')[0]
                 for model in models:
                     tag_id = model.find(TAG_ID)
-                    global_id, exists = GlobalId.from_xml_element(model)
+                    global_id, exists = GlobalId.from_xml_element(tag_id)
                     tag_version = model.find(TAG_VERSION)
                     if tag_version is not None:
                         version = int(tag_version.text) or 1

boards/models/post/sync.py

@@ -248,7 +248,7 b' class SyncManager:'
             tag_id = et.SubElement(tag_model, TAG_ID)
             post.global_id.to_xml_element(tag_id)
             tag_version = et.SubElement(tag_model, TAG_VERSION)
-            tag_version.text = post.version
+            tag_version.text = str(post.version)
 
         return et.tostring(response, ENCODING_UNICODE)